Analysis On The Potential Of Shale-gas Resource By Remote Sensing Technology In Northwest Guizhou

As huge unconventional energy resource,shale gas can be used as a strategic transformation advantage energy of the conventional energy.This paper focused on the synthesized feature of shale gas on the remote sensing images and the potential analysis that remote sensing applied to the shale gas resources exploration.Referenced the oil and gas remote sensing technology at the same time and successively studied not only the research area but also the known drilling area’s regional geological data,remote sensing data and other geological material according to the reservoiring mechanism of shale gas in Northwestern Guizhou as well as making the most use of remote sensing and geology instruments,comparatively analyzed and explored the regular pattern these two regions’ lithology overview,structural features and the remote sensing anomaly information, then quantitatively discussed the characteristic of advantageous gathering region which included shale gas,then predicted certain possible prospect regions in order to provide c ertain technical guidance on the stage of early working in energy exploration.Established the system of stratigraphic lithology interpretation symbols by the regional geological data and field survey report both of Bijie and Weixin mapsheet,then sorted out the stratigraphic lithology data on the basis of two 1:200000 standard geological maps and finally produced the stratigraphic lithology map with a scale of 1:5000.Then extracted the slope and elevation data that may be benefits to store shale gas by using ASTER GDEM V2 data in Arcgis 10.1,simultaneously combined with the Landsat8 OLI data to created the 3D terrain model and constructed the lineament and ring interpretation symbol on ENVI 4.8 software platform,and finally obtained the result figures of those structures. On the one hand,surface anomaly caused by hydrocarbon micro-seepage could be monitored by remote sensing technology,and this paper mainly extracted anomaly information such as hydroxy anomalies,iron staining anomalies,clay mineralization anomalies and carbonate mineralization anomalies by methods such as principal component analysis and band ratio from research area and known drilling area.On the other hand,land surface temperature abnormal zone could be retrieved with mono-window algorithm using Landsat7 ETM+ thermal infrared band data,and the synthesized information are capable of character izing the favorable oil and gas gathering zones,combing with the two rock-blocks that respectively contributed to shale gas,oil and gas,thereby reversely directed the shale gas regions.Combined with the results,based on the regional geological data and other referential materials,the sedimentary environment and development strata of the study area could be determined using the remote sensing technology.The regional geological conditions of the organic shale’s development were found out.In this study,the linearity and ring structures’ interpretation based on 3D visualization,remote sensing spectrum’s anomaly block associated with shale gas and the land surface true temperature could be analyzed.Through all above,based on the prospect areas’ optimization framework and reference index of shale gas and used the superposition and integrated technology,and using analogy method from known to unkonwn in order to preferably selected shale gas prospects,that is,through the known drilling area data,favorable place for gathering shale gas in target area can be forecasted and evaluated and four prospect-areas of shale gas with different levels were established at last:Wang Jiaba-Yantang region as the prospect areas was grade 1,and Yangchang-Liulong-Dafang was grade 2,and the north of Shuangshan-Huang Niyan-Songlin about 78 km2 area and located in the east of Shabao about 20 km2 area were all grade 3.